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Was Gen. Mattis right to speak out about Trump's leadership?

FILE - In this file photo dated Friday, Dec. 25, 2015, Britain’s Prince Philip leaves after attending the British royal family’s traditional Christmas Day church service at St. Mary Magdalene Church in Sandringham, England, Friday, Dec. 25, 2015. Buckingham Palace ... more >

Buckingham Palace officials said in a statement Monday that the 94-year-old Philip has “reluctantly” decided not to attend the events Tuesday in northeastern Scotland. The statement said Philip was following doctor’s advice.

He hasn’t cancelled other planned events and isn’t known to be ill. He has, however, suffered from heart disease and other ailments and has reduced his public schedule.